Method of distribution of correspondence and relative things in interior of country and abroad, by using post numbers (P. N. )
一种通过使用邮政信箱编号（P.N。）在国内和国外发送信件和有关物件的方法。
Method of distribution of correspondence and relative things in interior of country and abroad, by using post numbers (P. N. )
一种通过使用邮政信箱编号（P.N。）在国内和国外发送信件和有关物件的方法。
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